Electric arc lamp



Sept. 16, 1930. c. w. BERGANDER ELECTRIC ARC LAMP 2 Sheets-Sheet 1 Filed Sept. 29, 1927 p 1 930.- c. w. BERGANDER 1,775,806

ELECTRIC ARC LAMP Filed Sept. 29, 1927 Z Sheets-Shoot 2 Patented Sept. 16, 1930 UNITED STATES PATENT OFFICE CHARLEY W. BERGANIDER, OF CHICAGO, ILLINOIS, ASSIGNOR TO BRITESUN, IN-

CORPORATED, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS ELECTRIC ARC LAMP Application filed September 29, 1927. Serial No. 222,883.

My invention relates to electric arc lamps and has for its object the provision of means whereby the are between the carbons or electrodes of such a lamp may be quickly established by manipulation.

In carrying out the invention, one of the carbons or electrodes of such a lamp is provided with means whereby it may be placed by hand into contact with the complemental 19 carbon or electrode and may be separated from such carbon, following the establishment of the circuit through the lamp, to a limited extent which is determined by a stop.

The lamp of my invention, in its preferred 15 embodiment, is of the J ablockofi' type in which the carbons are placed abreast and converge to the location of the arc, the carbons being in contact when the circuit of the lamp is initially established and being drawn 2o apart to estabhsh the arc. In the preferred embodiment of my invention, the carbons or electrodes are maintained at a given angle during their consumption, the arcing ends of the carbons being brought into arc estab- 25 lishing relation by the straight line move ment of one carbon holder transversely to the other, that is, transversely to the axes of the carbons.

The invention will be more fully explained 30 by reference to the accompanying drawings in which Fig. 1 is an end view of an electric arc lamp as it is constructed in accordance with the preferred embodiment of my invention; Fig. 2 is a longitudinal sectional View of the lamp, the carbon pencils being broken away and the reflector that is usually employed being removed; Fig. 3 is a side view of a portion of the lamp structure taken on line 33 of Fig. 2; Fig. 4 is a sectional view on line 4-4 of Fig. 2;'and Fig. 5 is another longitudinal sectional view of the lamp structure with the reflector shown in place, a portion of the reflector being broken away.

The electric arc lamp illustrated is a thera peutic lamp adapted to emit violet rays, though the invention is not to be limited to the purpose of the lamp. It is housed within a hood 1 which is suitably supported. A mounting plate 2 is formed with ears 3 and .50 is secured within the hood by means of screws 4, said plate being perpendicular to the axis of the lamp and having an oblong slot 5 whose geometrical center is on the axis of the lamp. A metallic carbon holder 6 passes through the slot 5 and has a base portion 7 which is fixedly secured to a plate 2, at the rear side of the plate, by means of screws 8, the holder being insulated from said plate, the plate being desirably metallic. Another metallic carbon holder 9 also passes through the slot 5 and has a base portion 10 upon the rear side of the mounting plate. This base portion 10 is secured to the arm 11 by means of screws 12, this arm being pivoted to and upon the rear side of said mounting plate by means of the pivot bolt or screw 13. The arm 11, being preferably metallic, is insulated from the carbon holder 9.

The carbon holders are included in the lamp circuit to convey current to and from the carbons or electrodes 14 and 15 that are secured therein by clamping screws 16 and 17. The axes of the carbonreceiving elements 6 and 9 converge forwardly so that the carbons, which are held abreast, also converge forwardly. The carbons are brought together at their unmounted ends for initially establishing a lamp circuit. hen the lamp cir cuit has been established the arc is established by drawing the carbon 15 away from the carbon 14. Theadjustment of the carbon 15 is effected by suitable swinging movement of the arm 11.

A threaded rod 18 is screwed into and passes through an enlargement 19 that is formed upon the arm 11. This rod passes to the exterior'of the hood 1 and through the key hole slot 20 formedin this hood. A nut 21 is screwed upon the rod. This nut may be adjustable upon the rod or may be fixed thereto. It, in effect, constitutes a shoulder upon the rod. 'In assembling the rod with the aforesaid arm, the rod is inserted through the larger end of the key hole slot until the shoulder 21 also is passed through the larger end of the key hole slot whereafter the rod is shifted along toward the narrower end of this slot and is screwed into the arm enlargement 19, a knob 18' being desirably pro vided at the outer end of the rod. When the rod has been assembled with the arm 11, it serves as a means, accessible from the exterior of the lamp, whereby the lamp may be swung in one direction to bring the carbon 15 in Contact with the carbon 14 to establish the lamp circuit, and in a reverse direction to draw the arc. The carbon 14 serves as a stop to limit the movement of the arm 11 in a lamp circuit establishing direction. The movement of said arm in an are drawing direction is limited by marginal portions of the slot 5 which serves as an abutment to engage the shoulder 21. When the rod 18 is pulled upon to establish the are, it is usually moved until the shoulder 21 engages the hood 1 though it is obvious that the rod may be moved outwardly to a partial extent corresponding to the size of the are desired. The size of the are is determined by the extent to which the rod 18 is screwed into the arm enlargement 19. After the rod 18 has been suitably adjusted, it is only manipulated by pushing and pulling upon it except when it is desired to change the size of the arc.

The lamp of my invention is simple in operation and adjustment as will be apparent from the foregoing. The circuit is quickly established and the arc is quickly drawn due to the freedom of adjustment afforded for the movably mounted carbon 15.

The term carbon or carbons is used herein in the sense of any electrodes between which arcs may be established.

Changes may be made without departing from the invention.

Having thus described my invention, I claim:

1. In an electric arc lamp, the combination with two electrode holders, one of these holders being normally shiftable in position and having a range of movement permitting the electrode therein to engage the electrode in the other holder and to be separated therefrom; a rod assembled with the shiftable holder and having a shoulder thereon; and a stop with which said shoulder may be engaged to limit the extent to which the shiftable holder may be spaced apart from the CHARLEY W. BERGANDER.

other holder, said rod having threaded connection where it is assembled with the shiftable holder to adjust the location of said shoulder, with respect to'said stop.

2.. In an electric arc lamp, the combination with two electrode holders, one of these holders being normally swingingly mounted in position and having a range of movement permitting the electrode therein to engage the electrode in the, other holder and. to be separated therefrom; a rod assembled with the 'swingingly mounted holder and having a shoulder thereon; and a stop with which said shoulder may be engagedto limit the extent to whichthe swingingly mounted holder may be spaced apart from the other holder, said rod having threaded connection Where it is 

